There is a hard lump in the middle of the chest to consider the following possibilities: First, it may be breast hyperplasia, mostly related to the patient’s abnormal estrogen levels, the typical symptoms are a hard lump in the chest, hard lump will appear pain, nipple overflow, especially before the menstrual cycle, the symptoms will be more obvious, after the menstrual cycle, the hard lump will gradually become soft, pain gradually eased, oral medication or surgical treatment. Breast fibroids may be caused by a hard lump in the breast with a clear border, oval or round shape, which can be moved. Third, there may be other breast diseases such as breast cancer. If you have the condition, it is recommended to go to the hospital for breast ultrasound or mammogram examination, then according to the examination results, timely and symptomatic treatment.